Friday during a rally in Alabama for Luther Strange (R-AL) Trump went as far to call protestors a "son of a b*tch" for exercising their rights.
Federal Election Commission (FEC) forms released after Trump's inauguration in April show Khan donated $1 million to Trump's inaugural committee.
It will also no doubt ignite fiercer debate on an issue - and president - which in recent days has seen the National Basketball Association champions Golden State Warriors essentially reject the customary invite to the White House and led Cleveland Cavaliers star LeBron James call Trump a "bum".
Analysts predict even more protests as the NFL's Sunday games get underway with the Jacksonville Jaguars and Baltimore Ravens facing off in London this morning. The act of protest marked a sharp change from past National Football League games, CNN's Jake Tapper noted, in which only a few players made the decision to take a knee in protest of social injustice and racial inequality.
Meanwhile, CBS reports that the Pittsburgh Steelers did participate in the singing of the national anthem before the team's game against the Bears on Sunday. "We have a lot of work to do, and we can do it, but the comments by the president make it harder". I completely agree with Commissioner Goodell that we are better off as a nation when we are unified and pulling together.
Koeman: Wayne Rooney substitution was purely tactical
Incredibly, the challenge went unpunished by referee Martin Atkinson, who felt the full-force of Rooney's rage. It is frustrating from our perspective to come here and put that kind of performance in and not get anything.
The Jaguars have now won as many games in London as they have in Jacksonville since October 2015. "That's democracy in its highest form".
He was later joined by USA women's national team star Megan Rapinoe, who protested before games for the national team. The results are promising for anyone who thinks racism, white supremacy, and police brutality are bad.
NBA stars have also become involved in the issue, with LeBron James describing US President Donald Trump on Saturday as a "bum" over comments he made about fellow basketball star Steph Curry.
As commissioner, Goodell reports to National Football League owners, some of whom have supported Trump. Several NFL owners - including New England Patriots owner Robert Kraft, who is reportedly good friends with Trump - have also come out against the president's statement, as well as prominent players.